Chuck mechanism



Patented Mar. 6, 1928.

UNITED STATES PATENT OFFICE.

ELMER G. GARTIN, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

CHUCK MECHANISM.

Application filed June 7, 1920. Serial No. 387,240.

M y invention relates to chuck mechanisms and more especially to chuck mechanisms for pcrcussive tools.

One object of my invention is to provide an improved chuck mechanism. Another object of my invention is to provide an im proved chuck mechanism for percussive tools providing very simple locking means for the implen'ients adapted to be operated on thereby. A further object of my invention 'is'to provide an improved chuck mechanism in which improved implementlocking mecha.- nism is provided. A still further object of my invention is to provide an improved chuck mechanism in which readily replaceable tool locking mechanism is provided.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,

Fig. 1 is a central longitudinal section through my improved chuck mechanism showing the same with an implement, herein a drill steel, therein.

Fig. 2 is a transverse section on the line 2-2 of Fig. 1, the section being turned through 90 degrees.

Fig. 3 is a transverse section on the line 3-3 of Fig. 1, the section being turned through 90 degrees.

Fig. 4 is a fragmentary transverse section on the line 4-4 of Fig. 1 showing a detail of construction.

In the form of my invention which I have shown for purposes of illustration herein, the forward end of the chuck housing of a percussive tool is generally indicated by the numeral 1. Within this housing there is rotatably received a chuck rotating member generally indicated by the numeral 2 and comprising a portion 3 into which there is pressed or in some other manner suitably secured a member 4 having therein a bore 5 of a size suitable to receive the end of the drill steel 6. v.The member 3 is rotated in a well known manner by any suitable means. At the forward end of the member 3 a plurality of sockets or clutch jaws 7 are arranged for the purpose of locking in fixed angular position to the member 3 a tool receiving and locking chuck or driver member 8 which is provided adjacent its rear end with cooperating teeth 9 to loosely tit the sockets or jaws 7. The clutch teeth 9 are made of materially less strength, by reason of the less material in them, than the walls of 'the sockets 7, whereby breakage may be localized in the more readily replaceable and cheaper part. The driver member 8 is provided with a bore in alinement with the bore 5 but of different contour, this bore heilig indicated by the numeral 10. This bore, at its foremost portion, is provided with two enlargements 1l and 12 to permit the insertion therethrough of the lugs 13 of the drill steel 6. Rearwardly of the forward end ofthe member 8 an enlarged chamber 14 is provided, this chamber havin@ a bore ot' the shape which would be prodbuced by the partial revolution ot' a lug similar in shape to the opening of the front end of the member 8, thus leaving within the bore 14 a pair of inwardly directe-d wings 15 against. which the lugs of the steel 6 are adapted to rest during operation.

From the foregoing description it will be `obvious that I have provided a very simple means for the reception and locking KAof a drill steel 6, because upon insertion of the. steel 6 through the opening at the front end of the member Sand partial rotation of the member 8, or of the steel with respect to the member 8, the drill steel is locked inthe` chuck. It will also be obvious that I have provided a device'which is very simple to manufacture, in which breakage is localized in the cheaper and simpler part, and which, upon breakage or excessive wear of the chuck member proper, i. e. the member 8, replacement is very easy, merely involving the substitution of a new forward member and rendering unnecessary the scrapping of the relatively expensive member 2 or the dicult and sometimes unsatisfactory operation of pressing or screwing new bushings t-hereinto.

lVhile I have in this application specifically described one form which my invention may assume infI practice, it will be understood that this form of the same is shown` for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended. claims.

What I claim as new and desire to secure by Letters Patent is:

1. A chuck mechanism comprising a rotating member and a chuck member loosely' clutched thereto and provided with meansl for the reception and locking therein of a lugged drill steel, said member having also lug engaging portions adapted to support the lugs during rotation.

2. ln a drilling mechanism2 in combination, a rotatingr member provided adjacent its forward extremity with a plurality of sockets. and a chuck memher cooperating therewith and having teeth loosely interengaging with said sockets, said chuck memher heing provided within its interior with a chaniher for receiving the lugs ot a lugged drill steel and with means tor supporting the lugs during rotation ot the steel.

3. ln a drilling mechanism. in comhination. a rotatinx;T member provided adjacent, its forward extremity with a plurality ot sockets. and a chuck memher cooperating therewith and havin; r teeth loosely inter.

engaging,T with said sockets. said chuck member being provided within its interior with a chamher for receiving' the lugs of a luggcd drill steel and havin; r an opening into said interior ot less area than the cross sectional area ol said chamber and means for supportiner the lugs during rotation ot' the steel.

Al. A lug chuck for fluid actuated rock drills ot the hammer piston type, comprising a chuck sleeve adapted to he rotated, a cylindrical chuck bushing within the for ward end of said sleeve through which the shank ot a drill steel is adapted to extend in position to receive the impact hlows of the hammer piston of the drill, clutch jaws formed in the chuck sleeve, and a driver for a drill steel having clutch jaws cooperating loosely with the clutch jaws in the chuck sleeve.

'ternal lugs adapted to engage, the lugs on the steel and lock the steel in drivingr position.

(i. A chuck mechanism comprising?r a chuck sleeve adapted to he rotated. a chuck hushing.r carried within said sleeve adapted to receive the shank ot a drill Steel. and a driver niemher interlocking with `said chuck .sleeve adapted to retain a` lngzfjed drill .steel therein and support the lugs of the latter.

In testimony whereof l allix in v signature.

ELMICII (l. GAl'llN. 

